Fluid motor for dual brakes



FIGJ

Jan. 23, 1945.

L. G. NAUMANN FLUID MOTOR FOR DUAL BRAKES Filed Dec. 27, 1943 2Sheets-Sheet 1 INVENTOR LNARDGNAUMANN Y fl w ATTORNEY Jan. 23, 1945. 1..5. NAUMANN 2,367,734

FLUID MOTOR FOR DUAL BRAKES L EON DGNAUMANN ATTORNEY Patented Jan. 23,1945 FLUID MOTOR FOR DUAL BRAKES Leonard G. Naumann, Maplewood, Mo.,assignor to Wagner Electric Corporation, St. Louis, Mo., a corporationof Delaware Application December 27, 1943, Serial No.'515,708

6 Claims.

My invention relates to brakes and more particularly to actuating meansfor dual brakes.

One of the objects of my invention is to provide an improved doublefluid motor construction and mounting arrangement for.use in actuatingadjacent brake shoe ends of dual brakes.

Another object of my invention is to so mount a unitary double fluidmotor construction on a support that said motors are permitted to floatduring actuation of the brake shoes of a dual brake and at the same timebe sufficiently free to become 50 positioned by a pivotal movement thateach motor will apply the same force to the shoes it actuates in theevent there are differences in lining wear of like shoes of the dualbrake.

Other objects of my invention will become apparent from the followingdescription taken in connection with the accompanying drawings in whichFigure l is a bottom view showing a por tion of a dual brake havingactuating double fluid motors constructed and mounted in accordance withmy invention; and Figures 2 and 3 are sectional views taken on the lines2-2 and 3-3, respectively, of Figure 1.

Referring to the drawings in detail, my improved fluid motorconstruction and mounting arrangement is shown as employed for operatingthe lower ends of two sets of brake shoes of a dual brake but it is tobe understood that it can be employed wherever it is desired to actuateadjacent shoe ends of dual brakes. The dual brake has a supportingmember I secured to some fixed part and a drum 2 fixed to a rotatablepart which is to be braked. The brakes A and B, forming the dual brake,are positioned on opposite sides of the supporting member, the brake Acomprising brake shoes 3 and 4 mounted on one side of the support andthe brake B comprising brake shoes 5 and 6 mounted on the other side.The lower ends of brake shoes 4 and 6 have associated therewith ananchor pin 1 carried by the support. The pin has eccentric end portions8 and 9 extending from opposite sides of the support for adjustingpurposes, the end portion 8 cooperating with the notched end of shoe 4and the eccentric portion 9 cooperating withv the notched end of brakeshoe 6. In the particular dual brake construction shown the ends of thebrake shoes 4 and 6 remote from anchor pin 1 are also to be anchored andactuated by any suitable means but since such construction has nothingto do with applicants invention, it is believed unnecessary to show ordescribe it. The ends of brake shoes 3 and 5 remote from the ends shownalso have anchor means associated therewith which are not shown.

Positioned between the ends of shoes 3 and 4 and the ends of shoes 5 and6 forming the dual brake is a double fluid motor comprising a singlemember l0 having embodied therein spaced apart parallel cylinders I Iand I2 which are connected by a part 13. The cylinders are so spacedapart that the cylinder II will be positioned between the ends of brakeshoes 3 and 4 and cylinder 12 between the ends of brake shoes 5 and 6.-The intermediate connecting part l3 has an enlarged portion l4 and aflat portion l5. The enlarged portion is between a pair of ends of thecylinders and has drilled therethrough a passage IB for placing the twocylinders in communication with each other, said drilled passageextending to the exterior of cylinder [2 (shown in Figure 3) to providean outlet 11 for the two cylinders. This outlet is controlled by ableeder valve [8 in the form of a threaded plug.

The flat portion of the intermediate connecting part I3 is formed with aslot l9 lying midway between the axes of the cylinders and extendinglongitudinally of said cylinders. Received in this slot is a bolt 20positioned at right angles to the plane in which the axes of theparallel cylinders lie, said bolt being threaded into a bore 2| of thesupport I to fasten the member ID on the support. The body portion 22 ofthe bolt is of slightly smaller diameter than the width of the slot andthe head 23 of the bolt holds the member H1 in position. A washer 24 isprovided between the head of the bolt and the flat portion of theconnecting part to provide additional bearing surface. The threadedportion of the bolt is of slightly smaller diameter than the bodyportion 22 in order to provide shoulder means 25 for determining theextent to which the bolt can be screwed up and thus insure that the boltcannot be so tightened as to interfere with the free pivotal and slidingmovement of member It.

The cylinder I l is closed at one end by a wall 26 and open at its otherend and within this cylinder is a piston 2'1. This piston is connectedto the lower end of shoe 4 by an adjustable linkage 28, said linkagehaving a ball and socket arrangment with the piston. The closed end ofthe cylinder is connected with the lower end of brake shoe 3 by anadjustable connection 29 which is associated with a socket 30 in the endwall of by a wall 3| and its other end is open. Within this cylinder isa piston 32 which is connected 'inder axes.

to the lower end of brake shoe 6 by adjustable linkage 33 which has aball and socket arrangement with the piston. The closed end of thecylinder is connected to the lower end of brake shoe 5 by an adjustableconnecting means 34 which is associated with a socket 35 in the end wallof the cylinder.

Cylinder II is connected to a supply conduit 36 whereby fluid underpressure may enter this cylinder and also cylinder I2 through theconnecting passage IS. The supply conduit may come directly from asource of fluid pressure or from actuating fluid motors mounted at thetop of the brake if such is employed for actuating the other ends ofbrake shoes 4 and 6. Associated with the lower ends of the brake shoes 3and 4 is a retracting spring 3! and a like retracting spring 38 isassociated with brake shoes 5 and 6. These retracting springs hold thebrake shoes 3 and 5 released from the drum and brake shoes 4 and 6released from the drum and en gaged with anchor pin 7.

When fluid under pressure is admitted to the cylinders through thesupply conduit 36 the pistons and cylinders will be moved relatively toeach other and spreading forces will be applied to the ends of brakeshoes 3 and 4 and to the end of brake shoes 5 and 5. The member withinwhich cylinders II and I2 are embodied is free to slide relatively tothe support by the pin and slot arrangement. Thus it is seen that thefluid motors formed by the cylinders and pistons are free to act asfloating fluid motors so that equal fluid pressures will be applied tothe If the drum should be rotating in the clockwise direclower ends,each set of brake shoes.

tion, the ends of shoes 3 and will be engaged with the drum and the endsof brake shoes 4 and 6 will be moved away from the anchor pin andengaged with the drum under the action of the spreading forces. If thedrum should be rotating in the counterclockwise direction and if shoes 4and 6 should have an actuating force applied to their ends remote fromthose shown, the spreading forces acting between the lower ends of theshoe by the double fluid motors shown will be effective to actuate onlyshoes 3' and 5, into, engagement with the drum since the forceseffective on shoes 4 and 5 will not be sufficient to overcome the,force. being applied to the remote ends of the shoes plus the forcewhich is caused by the drag of the brake d um on the shoes. The pin andslot mounting of the cylinders II and I2 permit them to slide freely tomove shoes 3 and 5.

Since the brake shoes are provided with lining which is subject to wear,it is possible that the linings on the various shoes may wear unevenly.If uneven wear takes place, it will not have any effect in preventingunequal forces from being applied to the shoes when the mountingarrangement described is employed since member It! in which cylinders IIand 12 are embodied is free to pivot on the support. Such would not bepossible if the member ID could only slide longitudinally with respectto the cyl- If the lining on shoe 3 should wear faster than the liningon shoe 5, the member ID- can pivot and thus permit a greaterlongitudinal movement of cylinder H so that the applied forces to theshoes will remain equal. Suflicient pivoting of member ID is permittedfor all ossible differences in lining wear by the slight clearancebetween the body of bolt 20. and the-slot in-which it is received andalso the clearances between theadjustable connecting means-..-

29 and 34 and the shoes and cylinders with which they are associated.Furthermore, the shoes 3 and 5 are mounted in order to have some axialshifting in the drum thus adding to the permissible pivoting of memberIn. Pivotal movement of member ID will not be resisted by the connectinglinkages between pistons 2'! and 32 and shoes 4 and v6 due to the balland socket arrangement with the pistons.

From the foregoing it is seen that a double floating fluid motormounting arrangement is provided for dual brakes which permits thecylinders to be embodied in a single member in order to be connected bya drilled passage. The

cylinders are free to have sufficient movement in shoes pos'tioned oneach side of the support and having adjacent ends, two spaced parallelcylinders having a rigid intermediate connecting means, means formounting the cylinders on the support so that said cylinders are onopposite sides of the plane of the support with each cylinder positionedbetween the adjacent ends of two shoes on the same sde of the support,said mounting means comprising means associated with the connectingmeans and the support for permitting pivoting of the cylinders about anaxis at right angles to the plane in which the axes of the cylinders lieand said last mentoned means also permitting bodily longitudinalmovement of the cylinders, a piston in each cylinder, a connectionbetween each piston and a brake shoe,

.. and a connection between each cylinder and a brake shoe. v 1

2. In' braking apparatus, a support, two brake shoes positioned on eachside of the support and having adjacent ends, a single member providedwith parallel cylinders, means for mounting the member on the support sothat thecylinders are on opposite sides of the plane of the support witheach cylinder positioned between the adjacent ends of two shoes on thesame side of the support, said mounting means comprising means.permitting pivoting of the member about an axis in a plane at rightangles to the axis of the brake and said mounting means also allowingbodily movement of the member in a plane at right angles to the pivotalaxis, a piston in each cylinder, a connection between each piston and a.

brake shoe, and a connection between each cylinder and a brake shoe.

with parallel cylinders, means for mounting the member on the support sothat the cylinders are on opposite sides of the plane of thesupport-with each cylinder positioned. between the adjacent ends of twoshoes on the sameside of the support,

said mounting means comprising a slot in the member extendinglongitudinally between the cylinders and: a pin. carriediby thesupportand. .extendingthrough the-slot, a;piston: in: each cyla inder, aconnection between each, piston and a brake shoe, and a connectionbetween each cylinder and a brake shoe.

4. In braking apparatus, a support, two brake shoes positioned on eachside of the support and having adjacent ends, a single member providedwith parallel cylinders and a passage for placing the cylinders incommunication with each other, means for mounting the member on thesupport so that the cylinders are on opposite sides of the plane of thesupport with each cylinder posi tioned between the adjacent ends of twoshoes on the same side of the support, said mounting means comprisingmeans permitting pivot'ng of the member about an axis in a plane atright angles to the axis of the brake and said last mentioned meansallowing bodily movement of the member 'in a plane at right angles tothe pivotal axis, a piston in each cylinder, a connection between eachpiston and a brake shoe, a connection between each cylinder and a brakeshoe, a supply conduit connected to one cylinder, and a valve-controlledoutlet for the other cylinder.

5. In braking apparatus, a support, two brake shoes positioned on eachside of the support and having adjacent ends, two spaced parallelcylinders having a rigid intermediate connecting means provided with adrilled passage placing the cylinders in communication with each other,means for mounting the cylinders on the support so that said cylindersare on opposite sides of the plane of the support with each cylinderpositioned between the adjacent ends of two shoes on the same side ofthe support, said mounting means comprising a slot in the intermediateconnecting means extending longitudinally of the cylinders and spacedequally from the-axes thereof and a pin extending through the slot forholding the cylinder on the support and for permitting either thepivoting of the cylinders in the plane of their axes or a longitudinalshifting thereof, a piston in each cylinder, a connection between eachpiston and a brake shoe, a connection between each cylinder and a brakeshoe, and a supply conduit connected to one of the cylinders.

6-. In braking apparatus, a support, two brake shoes positioned on eachside of the support and having adjacent ends, a single member providedwith parallel cylinders, an intermediate connecting part having a fiatportion and a passage in said part placing both cylinders incommunication with each other, means for mounting the member on thesupport so that the cylinders are on opposite sides of the plane of thesupport with each cylinder positioned between the adjacent ends of twoshoes on the same side of the support, said mounting means comprising aslot in the flat portion of the member extending longitudinally betweenthe cylinders, a pin carried by the support and extending through theslot and means on the pin cooperating with the flat portion for holdingthe member on the pin but, permitting the member to have pivotal orsliding movement with respect to the pin and support, a piston in eachcylinder, a connection between each piston and a brake shoe, aconnection between .each cylinder and a brake shoe, and a supply conduitconnected to one of the cylinders.

LEONARD G. NAUMANN.

